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During the last two decades dense rare gases have attracted a great number of workers due to their potentiality as laser media. In this respect a detailed knowledge of plasma kinetics is of great importance. A recent study of kinetics and decay processes in argon has shown that the 4s atomic levels act as decay steps. The present communication reports on a method allowing the kinetic study of an argon plasma by transient visible absorption spectroscopy from the frrst 4s-level manifold. Thedoi:10.5281/zenodo.438921 fatcat:wtzin4puf5d5djkdjmbl6src2a